By four years from now, either the teachers unions or the pack of education policies that are hot these days is going to be a lot less relevant. The American education world doesn't seem big enough for both of them.
Frankly, I don't know if I'm right about that, but it is certainly an interesting prediction to consider, given what is happening nationally and locally.
It would seem smart to bet on the teachers unions - they're still pretty strong, they're politically powerful, and their bargaining rights are established by law. Education fads come and go, but unions stay on.
But there are some reasons to bet the other way.
The overall economic troubles of the nation, the rapidly escalating financial problems facing school systems, and the popularity of ideas union leaders generally hate, such as factoring student performance into teachers' pay, are putting unions on the defensive in ways similar to what has happened in other sectors of the economy.
Whatever the future, the collision between teachers unions and the forces of change is pretty amazing. For one thing, it pits Democrats against Democrats in a battle that may have major repercussions on the 2012 presidential race.